Stapling device



Feb. 11, 1930. c. A. PALMGREN STAPLING DEVICE Filed Sept. 29, 1927 2 Sheets-Sheet l Feb. 11, 1930. c. A. PALMGREN STAPLING DEVI CE Filed Sept. 29, 1927 2 Sheets-Sheet 2 a 1% 3 H iw i Patented Feb. 11, 1930 CARL A. PALMGREN, OF CHICAGO, ILLINOIS, ASSIGNOR TO PALMGBEN STAIPLING DE- VICES, IN CORPORATED, OF CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS STAPLING DEVICE V 7 Application filed September 29, 1927. Serial 110. 222,799.

The invention relates to a stapling device of pistol like form and to be operated in a like manner, wherein a reciprocating driver actuated by compressed air is utilized for forming, shearing oil and driving of the staples fed from a magazine containing a coiled strip of stapling material consisting of several hundred staples prepared in the flattened state so that they may be coiled up into cartridge form for placing into a magazine and out of which they may be fed into position for bending of the prongs downward over an anvil for forming a staple simultaneous with the shearing and driving of a fully prepared staple, and the objects of my invention are: first, to provide a stapling device in the form of a pistol to be operated by compressed air having a handle or pistol like grip and a thumb rest or socket wherein the thumb can be used for pressing downward preventing recoil of the device While in the act of driving a staple; second, for the driving of much larger staples than those usually used and driven by the ordinary hand driven type of stapling devices, and wherein the staples used will have legs of equal length and holding power to the usual carpet tack and thereby provide double the holding power; third, to provide a stapling device wherein a strip of stapling material consisting of several hundred staples prepared in the flattened state may be placed in coiled form and for feeding the material into position for the making of completely formed staples, and the shearing off and driving of same into the material to be fastened; fourth, to provide means within the device for bending the prongs of each succeeding segment of the strip of material into staple form and means for shearing off and driving of same after being completely formed; fifth, to provide a suitable means for feeding of the material into position for forming and driving of the formed staples and simultaneous operation of the forming, shearing and driving means by the feeding trigger; sixth, to provide a stapling device that may be readily attached, or detached, to or from a flexible hose through which the compressed air or power is supplied; seventh, to provide a stapling device upon which the palm of the hand and thumb may be placed in the most suitable position for hearing down on and preventing recoil action of the device while in operation, and of convenient form for aiming upon the spot where a staple is to be driven; eighth, to provide a suitable stationary guide for preventing the staples from tipping after they have been sheared off and while in the act of being driven.

I attain the above mentioned objects by making use of the novel form of construction shown in the accompanying drawings in which, Figure 1, is an exterior View showing the barrel 10 in which the driving mechanism is placed, the magazine chamber 11, operating lever or trigger 12, pistol grip l3 and thumb rest 14; Figure 2, a vertical sectional view taken on line 2-2 of Fig. 3 showing all of the working parts; F i ure 3, a vertical view looking at the muzz e end of the device showing the opening out of which the staples are driven, also showing an assembly of various parts; Figure 4, a plan sectional view taken on line 44 of Fig. 2, showing the driving piston in section together with the driver 16 in the foreground with the folding member 17 shown just below the driver, while the folded staple YY is shown bent over the anvil 25. Figure 5, a fragmental sectional view taken on line 5-5 of Fig. 2, showing the cross section of the barrel and piston, a front view of the trigger 12 and a part of the spring arm of the feeding mechanism; Figure 6 a perspective view of the anvil block 19 and anvil 25 inserted and showing a portion of the anvil in the foreground and over which the staples are bent together with the staple guide also shown in the foreground; Figure 7, a fragmental vertical sectional view taken on line 7-7 of Fig. 2 showing the anvil block with its two raised flanges provided for guiding of the staples while being fed into position for folding and driving, and with a fully prepared staple fed into position for driving and the prongs of the next succeeding staple shown out over the anvil ready to be folded; Figure 8, a fragmental view in section taken on line 88 of Fig. 2, showing the method of inserting the anvil block 19 into the barrel portion of the device and the opening throu h which the staples are fed to the anvil; Figure 9, a detail of the stop block 18 showing the slot"""201"ovided to receive the anvil block 19.

The mechanism for driving the staples consists of the piston 15, driver and shearing member 16 and bending member 17 held together by the pin rivet. 15' and in retracted position in Fig. 2, and are provided to reciprocate within the bore 10 of the barrel 10; and in the muzzle end of the bore 10' is a tight fitting stop block 18 through which an opening 18 is rovided and formed to fit the driver 16 and ender 17 acting as aguide and in which the members 16 and 17 operate freely but with close enough fitting to allow proper alignment of the cutting edge 16' with the cutting edge 25", and as a means for securely holding the stop block 18 within the bore 10 the anvil block 19 is inserted in the notch 20, Fig. 9, and also in the two notches 21 and 22, Fig. 4, provided in the side walls of the barrel portion 10, and to prevent endwise movement of the block 19 the pin rivet 23 passes through both walls of the barrel 10 and block 19. Lengthway in the block 19 a roove 24 is provided to receive the anvil member 25 being held in this groove by the rivet 26; at the lower end of 19 the magazine cover 27 is mounted upon thepin 28 and acts as hinge thereon as shown in Fig. 2 and Fig. 3; the upper end of anvil 25 1s formed as a hook as shown at 25' and this hook provides the anvil portion over which the staple prongs are bent and extends downward over the face 19" 19. At 30 is shown a hook which is part of the magazine cover and provided to snap over the catch 31 as a means for locking in the closed position, while the stud 32 is provided as a means for opening the cover. At 33 a filler block is shown inserted in the slot 34 machined into the lower portion of the body of the barrel 10 for the purpose of housing the feeding mechanism as shown in Fig. 2 at 3536-37-38 together with the feeding trigger 12, this feeding mechanism being provlded for the purpose of feeding the stapling material through the opening 39 to the anvil. 40 shows an admission valve through which the compressed air is admitted for operation of the piston 15 the compressed air entering through theport 41, valve chamber 42 and port 43 after the relief valve 44 has been closed due to the action of trigger 12 and the contacting face 12 raising the valve stem 45 forcin the relief valve 44 up against the seat 46 t ereby closing off relief port 47 and at the same time opening the admission valve 40 against the action of spring 48 provided tomaintain the valve 40 in the closed position. The valves 40 and 44 are made in two parts and are secured toof the anvil block gether by rivetingthe valve 44 upon the stem 45 after they are inserted in place. In the piston 15 are shown two-small bores 49 into which are inserted two springs 50 and two small plungers 51 provided to butt against the end wall of stop block 18, as shown in Fig. 2 and Fig. 4 and are provided for the purpose of retracting the piston 15 together with the members 16 and 17 after the driving)of a staple has been effected.

peration of the device is accomplished through a pull of the index finger upon the trigger 12 actuating the spring lever 35 which is mounted to swing upon the fulcrum 35', arm 36 and feeding pawl 37 against the action of spring 38, which is provided to return all of the feeding mechanism to normal position after release of the trigger 12; this operation feeds the prepared staple out over the anvil 25 and into the guideway 18' and against the guide faces 18 as shown in Fig. 2 and Fig. 3 at Y-Y where it will be brought to a stop, sheared off from the strip by action of the cutting edge 16' of the driver and the cutting edge 25" of the anvil upon action of the piston whereupon the sheared staple will be driven out through the guide way 18' and into the fastening material. To revent pre mature action of the piston 15 before the prepared staple has been fed against the faces 18, the levers 35 and 36 being made in one piece and of spring material the lever 35 is made leaf like for the purpose of having a spring action so that it will yield after the feeding pawl 37 has been stopped by the action of the staple Y-Y striking the faces 18, and permit further movement of the trigger 12 for opening of valve 40 and the closing of valve 44. v After a staple has been driven and upon release of the trigger 12 the valve 40 will be closed by the action of the spring 48 together with opening or valve 44 which will 0 en the ort 47 allowing the air to es-- cape rom bac of piston 15, whereupon, the springs 49 will return the piston 15 to normal position.

For the purpose'of preventing the staples tipping over after being sheared off from the strip I provide a guide for each leg of the staple, as shown in Fig. 6 at 19*, having a raised gortion of the block 19 as at 19 and just be ind the raised portion the inclines 19 are provided forming a hump over which the points of the staple legs just touch as they pass over, and upon shearing off of a staple the points will strike the radius of each hump before tip ing and they will be forced by the faces 18 and 19.

At the start of a new coil of staples the outer end of the strip is inserted into the opening 39 enough for the prongs of the first staple segment to strike the shoulders 18 which act as a gauge for stopping the strip and for forming of the first staple over the anvil outwardly into t e guide-way 18 to be guided v 25 by action of the folding jaws 17 bending the prongs downward on each side of the anvil, the balance of strip being coiled up in the magazine as at X.

At the lower end of the grip 13 is shown the usual pipe threaded socket to which the flexible hose is attached.

It will be noted that the magazine 11 is cylindrical in shape when the cover 27 is closed thus providing for the coil of stapling material X to be rotated and unwind without the use of a spool or reel as shown in my Patent No. 1,067,541 issued July 15, 1913.

Having described my invention what I claim is:

1. In a stapling device, a c lindrical chamber for containing a strip 0 stapling material formed into a coil, means for feeding said strip of material to an anvil over which staple blanks are formed in the strip, means cooperating with the anvil for forming the staple blanks, means for shearing the formed staple blanks from the strip, and an air actuated means for driving the staple sheared from the strip of stapling material.

2. In a stapling device, a pistol like form consisting of a pistol grip, a cylindrical chamber for holding a strip of stapling material in coil form, a thumb rest in combination with said )istol grip, means for feeding said strip 0t stapling material from said cylindrical chamber to an anvil over which sections of said material are bent into sta 1e form, means cooperating with the anvil For forming the sections, and means for shearing off from the strip a formed section together with means for driving same.

3. In a stapling device, a pistol like instrument consisting of a cylindrical container provided for holding a strip of stapling material in coiled form, means for feedin said stapling material to an anvil over whic sections of the strip are bent into sta 1e form, means cooperating with the anvil or forming the sections, means for parting a formed section from said strip, and air actuated means for driving the staple after being formed.

4. In the combination of a stapling device, a pistol like instrument consisting of a pistol grip, a barrel formed on said grip, reciprocating members actuated by air pressure in said barrel for the purpose of dr1ving staples, a cylindrical container for holding a strip of stapling material from whic staples may be made, a feeding mechanism actuated by a trigger, an anvil over which the stapling material is fed for the formin of staple blanks, means for foldin said stap ing material over said anvil for the purpose of makin staple blanks, and means for shearing of? the formed staple blanks from the strip of staplin material.

5. In the com ination of a stapling device,

a pistol like instrument having a suitable gri thereon for the ur ose of being gras ed witliin the palm of 5m and, a reciprocating staple driving means actuated by air pressure within a cylinder on said grip, a container for the purpose of holding a strip of stapling material in coil form, feeding means for feeding said strip of material upon an anvil over which sections of said strip are bent into staple form, a trigger for operating said feeding means and said driving means simultaneously, said drivin means having a folding member thereon %or the purpose of bending sections of said stapling material over said anvil into staple form, means for part ing the folded sections from said strip of material, and means for retracting the said driving means to normal position.

6. In a stapling device, a barrel-body having a recess forming the closed upper portion of a cylindrical chamber for a coiled strip of stapling material, opposite semi-circular side walls projecting outwardly from said body and forming the lower portion of said chamber, a semi-circular cover formed to the radius of said side-walls and hinged at one end to said body to open and close said chamber, and means at the other end of said cover to lock it in closed position.

7. In a stapling device, a barrel-body having a curved slot in its lower portion, a pair of spaced semi-circular side-walls projecting outwardly from said body in extension of the Walls of said slot and forming therewith a cylindrical chamber for a coiled strip of stapling material, a semi-circular cover formed to the radius of said side-walls and hinged at one end to said body to open and close said chamber, and a catch at the other end of said cover to lock it in closed position.

CARL A. PALMGREN. 

